diff --git a/firefox-esr-us.rb b/firefox-esr-us.rb
new file mode 100644
index 000000000..a35757759
--- /dev/null
+++ b/firefox-esr-us.rb
@@ -0,0 +1,8 @@
+class FirefoxESR < Cask
+  url 'https://download.mozilla.org/?product=firefox-24.4.0esr&os=osx&lang=en-US'
+  homepage 'http://www.mozilla.org/en-US/firefox/organizations/faq/'
+  version '24.4.0 esr'
+  sha256 '15795780f50e672c44a9115092be1e632caec2f2b2fc8e1cf01ea9292c2c4fd7'
+  link 'Firefox.app'
+end
+